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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd288fd737d79bac80f3074838f3e7d9e4e8b6a0f5c1e5d67c7fc10b50f72d3ee' 
  AND token = '2U97IOGtzWhI0QIWEzth2GNnzIjXu0OKl8TyhBSGy3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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