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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5a0f96e9e2955be559ec85d6a3171e61403b5250f7e9083aa4e3180312b733' 
  AND token = 'DrtZbDc4xXpaArl+cV9u7FB4IKLikfOeCUKR74cftF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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