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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a03c38513a4d574cdaddbb4716e4f7f51cdbb4a207bea92f3d54cf97bf564a' 
  AND token = 'rmv0nX6W2snZ09oFEh7dg73p/ugxEO4XHhGwAYr0JgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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