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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a5e17b783099367cfed3128ac8cdca913d38f7f494fe18e4e9cb404c490569' 
  AND token = '/HJQX35Dmef+ZJ2Ej0PfDyR9TJYDjVLI3+lJqmJPbWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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