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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa7224aaa7de0092702051bcdf21b39b13afe9e7bb2d48de72dd113ed962d0c' 
  AND token = 'VHOpM7nQinaq3qHMldxbJXg+zhhlsYMKtKPptnqMixc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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