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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12fbe1454d72e176b7c9c3f118b860b67e93079c6b275a6fea44e8196673ff3' 
  AND token = 'wbnIUkWE83XD2zLghaPl/dhO1hYQSnn1JcCMQH5VDV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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