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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfba804a8904934270434db04edf2d9a687aff2d54f2d0c2eafeda95d497583' 
  AND token = '/LcTe3y9BaaR8pZd2085n5mSfrmeyW/a0NKzdO/eNqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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