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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66db803d8422a3ce7e2a66347cf5395f227ceeb752a2a3486c1a170089f920cc' 
  AND token = 'ahKh+WN7NJ2AbUT21v3YVAGB2wvh5pPKJ6yyEDpAUkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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