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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c8df3b68c0248025a98350eeeacf617de4b3f5d38af9d1a16a6bfe6f85d9db' 
  AND token = '33dqM9hcj0P4fPOaTgrFtKti2YN2C7lnrkafXtRJRRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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