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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeafcfc436f289bed663bdec126b88a5b27c74da9814c836163beb927962749' 
  AND token = '16BQQNvgSa6JX7yK4as3jfCHmmQIFXv0Kgx30uLhEbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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