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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db35d088b2a7b836b8ccf584eaf5934b77325f7686bb732eefd2f8c1f8d648c' 
  AND token = 'XNUDqMSLnx5YSUysdPGBJdSu0QU7wsfcC14X10Y+1fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}