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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8e8203937e8fb63c292161e5096a5748a08d966412ba1a1bfcd2726568785b' 
  AND token = 'arXXIzguPT8JbFtEX4dLsyAZ+q7MHcKNaWFgWXuREVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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