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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e10f320f29811b88ae840aa154b1e5084c183274717ebc558016360a964ac4' 
  AND token = 'mWgbUW0FZ4ZSh9ElRdMo3aWhkDru8rb7bNzr+RAKxVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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