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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076f0f181392925d79aec89e769b1331f53c535beff13ce518d89bcdc0d70865' 
  AND token = 'm88fiIrb8FoUbXyCvbynGELypNi5/bfp5yih8l/tWA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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