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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b127082eb7ef0978d215c2d208e23de590dec516fa9dbb45d37499987fa18574' 
  AND token = 'kgcMc8YQ4+a71W2e6MDaDUetPJvkhSJMB/GXaUqoz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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