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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db803275505e40b2419ea331a72a4fdc6f76c0519b7c9805feeb2c9338b2002' 
  AND token = '4/Eld+W+sZcBVSf2fzjfy6jRbt9/MquslOfxWur1E48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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