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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733704cab8eac82c1131ddc45df2cf1d8a9083e7601e5f987b6a21b80a5b7713' 
  AND token = 'Y6HsWLaNWugCob5AdJ6iWtGB/Yjo8m+soVpY3Pc9VL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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