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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93752497ea1bd4fd9f97e0d80511c520e707e49cab579f01470e8db4cf1cf32c' 
  AND token = 'iWHtwkTV3wkNBYcOoObneqp6k5Q/+jklLgWdEJFGK7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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