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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf60d2a2d4b15aea725b6ab8a96400b64e23055695c9c0c4888a8cc70780b0a' 
  AND token = 'DGho3tG0RfdLlOM1MHO/dOhu++XJ/RWu9pS0OgkiV2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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