SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04748f1fd05983c3abeef6bae7508e429efda461d370cf68051b36ce6c14b09' 
  AND token = 'Q5e4NKbpglrFuvhp+s9O74HLsEfhYkk88Q6/zjqsGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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