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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5750b76e6aac8f9c235a3249123eba0c730ccdbb04141e986a00e958870af36' 
  AND token = 'x06Fkghuu5SjnJLmNnd9aX3N3LlL5fR5pO0SL/vhWns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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