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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffea905ac22da81e47c5adec279da4ff52046e3358812447bc960b2b94f58d4' 
  AND token = 'm4yEP5C5jfHG3QsNW34Tyzc8pLwCCNX3LI6v5ioxzDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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