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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1569f0c7379585ae99a12a687a5fdf07cefe53c204bb9f75b533481bea4a0f' 
  AND token = 'P4XU/jdtsiAyDgxPd4yaXNdaAWYtny7TdT7s4UXDdEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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