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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e599efeb1b18015d08375c9fea6fb033a1d5d4a93a5523646fda84ae47bef38' 
  AND token = 'mqXAMNd9RNfRzIho4m7H/4+Ex6qfnumRtzeD3/3ylwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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