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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641d987922b16c5ca4398c23ee1732933ce2602ff78c89860e301a9f493fe3d9' 
  AND token = '5dvJiKcRlTTO0FOX58QyBNokHbRd+SwPTiA69yclEaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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