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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6b81f23457a2f81c54460757780f2891eda848ecd62135bc7845488efc1f8a' 
  AND token = '2rq5KTHfnTtlvQjTc2yV8X9D6A33Xz4g50tZ+otd2YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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