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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6170615f0ccffa2e60e436561d572c73f7a0a05455033f12c80f4ec131285d19' 
  AND token = 'uT4UuahzwNsrQK5jJTy52wVf99sfJ6wbmNRSgh30mjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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