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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd38d83f582c5710dc269a93b3df71a0a2eb08fad1d95971a0fcd5f85405d6' 
  AND token = 'H35vFvvEzZl9c4UlnMu5lGJ0s2tgXo6b8mUcEIjO4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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