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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b588723b0cce144a17aef16541511fbc7ff60e96c0deb7f102b76c7553802bd' 
  AND token = 'pLFJzeETQ/u9nAWHb+qGPRgA9mk/LT+POOmHv2LOUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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