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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb7f639450871c18a91414619184e2a23464d64bc98b90ecdb493bfdc24d179' 
  AND token = '3dZDsdJToMFOq8i3mwAqmHIfM2auiyGqPnpcKoTiTIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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