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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb16c2b98d0062c4c2d8b1cecc4f6347ab17e26aca832788c24aea0a6a2f2fb' 
  AND token = 'DhUM9727X5hPeoaWR4qrZoQNNVBoB7yWhwWYcd62hIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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