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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dba9482a20ce63d927035bc71b7f8063913808e5a0812d6151cbd7fbe558f9' 
  AND token = 'JMa/9Pk+i+aCRsFdDkCNLr8y0meuA3fXxS3ynIOyiFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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