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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce97d1bbe3d7473aa0d4b20764a23ceeea21c6e128b1435cb93a39ffd292a20' 
  AND token = 'BDRVaZKCBb4FSrlPEKg+nCHQb8DEvU9Tl0yaMFnsqCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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