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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acda04906a4c5732223107434a186119b459a599634bb08cbb3907c5e51c5695' 
  AND token = 'SrkibhtRIrZyMHE7cUQIni7wuKlLsQlXAxZPczSYAhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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