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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924e27577ab17015ae76929c1ada5e529420badd5de0e05f29bbb6d231000c07' 
  AND token = '9HbL14u6d7Hy1Gx+Xek8zpbgcPDoC8+kr+pCkkkanZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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