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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00db0164b40a1305ede00f2b19e04ca56e41c964f5ca24ebd059df1e7b80cb99' 
  AND token = 'mSXhjhV8Fzek3cdHw0fDMZuZ1l3rMjFq1dwdRRECF5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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