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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b079c88d679643305f819ad8fa0e2302faec884749e97ebded4fbc63752a07' 
  AND token = 'N6b36s0KsaYHJEk/0bbL6C8tLhkycha/M3GR7TG3erQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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