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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b79b830a480ba60b5f2e493490ec6ae38293edeae0dd71a8de7d6a7d6d1123' 
  AND token = 'zpVEs9Qb0nlmGpKl1JH3tq4cNji/ZfRhKTR4EGjat0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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