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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be99afe1c7637a9912a6b5bac6b72ab1884bae9f508a69ae4a665fe5f93803ad' 
  AND token = '7ocvHzk2UVPOaYrSZIFd5+orU77V9qNAG7u6FtL13uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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