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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05c30d7c18533743097ffe71036ed4085f2e3fd041a939ff74aeb64336bebee' 
  AND token = 'Yyyvj/hfssSVZxG919RvD/v5AhcXtQyd+3g0s0tgfb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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