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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bb77e76afbe5e90b778ff2f279cbef930dfca9fc133a3b59e2e1c601afeda7' 
  AND token = '44n6eBbh8zQt5o/g2vEar/AzC23o+kLe5ffXFV0RFQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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