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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb81028972677c717f7b66167b6d107ff5f8d3c4cf50ce4936b56404ca559c7' 
  AND token = 'mTwW1AYEX1UbivLbpe7F/yYt+CYwmlB/mD5qoo9I/mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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