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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ffcda7a573d49b029899950f6b95642ab7eb390398193d9335b15d8bf050cc' 
  AND token = '869ACghWb+3ahYpfzkZhzNn7760OOJI+PVf4Zjzmpps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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