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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed91537561804e198adeb58502838a1bf2bebc32fd135bf4c2ce44d6dc4c391' 
  AND token = '17pz7X9sSKbwj6Y0QL7BTLP6nE+FStxVc+Rx5hkbTWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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