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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1816c2d54fc07eb45ae1ad023bce7dfb94d7936425d40ef8ea25d3d7ce012920' 
  AND token = 'HyhYE/hvQt0L1r9w4rVOusaM5Ma8p6unkh0qMourDik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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