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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36561a6aedf0f59b8b8a994e86b3a6ed9f5e06fee880307f2457b38e9479ae89' 
  AND token = '3ktECbhRRn5y2hZ1DMzK6kfNy61GWdMgJWrYfzMle5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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