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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54e60b5564b263e445220d137ea8cda2412014e54c9426151ce30b9609bac98' 
  AND token = 'iVmZM7GPEmGkqSZwbwv9+L4WbKaQ99XTjZPyXkONNds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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