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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d5ecf48858f44da22b3fe2ea28661f6aa8a4b4b774207afe486cb1ce7a400d' 
  AND token = 'AQdcDG8xviocwmkWCQBskj5ZrejrHGIkExT6kw9Dw+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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