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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e591273efd9cbd51052e9f6d919ea12885564efe10ff769a7cbdb9046cc05f14' 
  AND token = 'kgFD9jx0iFsBBen2wYppTX1b2VWtTvk956syn99/nEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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