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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d915e19a15c39b9c6df813443a4cac5059ba0cf728c74d9ce0eb7deb18097a' 
  AND token = 'Y76uLTIz5vaSRMixT2gBSW6iLzpHGo3RnW3C2amRW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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