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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d0396b92f39ef1d7519c9fcfce1d51ecbc97ff7f8d5fc1bd26c5176b68b5cc' 
  AND token = 'rrics6D2TqHdgx8uYCgYJcWlWo2KDb99RaCsqVeoGPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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