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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d6feea3f3aab29f07ab63ad7dd79a338490e32fd5fc05d7bdecc66e46bcc4d' 
  AND token = 'YjS9XG12YbT6lscpb394Rj0xIvXKTHAkj+DNqtds1Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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