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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6002383c9e93344660ce3c3e14072cc6a4a4324b8a913d9c95bec3533a9385ee' 
  AND token = 'KXYKh8FWiHOycaGzVg4SkplotQO4rY8tk2rfiIXWeSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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