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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1262aade946a4623540e552436027dd175f5e390c1b314bcbcac19a6c3d714cd' 
  AND token = 'lq6FrxpussXg6EddGwREPb4ESTWFHIw8cUj/nIYBmw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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