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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ef45356db7d628d4802cd6690b0f8ca0e8b966c642a867c4d802bb862b6d40' 
  AND token = '6ty5aS0rftYSA4qW7tESy1qgs/pP6pRC7hraRfSv9SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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