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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa5914f610c3f7c9d2e3ffa84bb4cd4da30463494f3ae73bf900db31f9f1340' 
  AND token = '+5dCavuoMBM0TclRt/QFAS1CbLYs4RnkVoc43HcQ8ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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