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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d92e314b59cfad114fe9a74781c3e5a344acde5fb4c6352615682db334710b4' 
  AND token = 'F6t0GNfp1A662BxZOXqEm5DZcoTIUB5ef5jLTIkgBWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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