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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e26cde6b44ae3eeb3be7083d55cec5fdaf05c1f9dc520b9d9aa783b49f5c7ba' 
  AND token = 'OfM8V9Ln7MOHNvD6Ral1IUl5LTcducvp2EguY7Sl87g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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