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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3128d849f224c539e35efe0554e1c5e232e7570fcc8ac0e0b6c3cd7ea5d78776' 
  AND token = 'TqugjeFO8w9feuulYg4yVS23yTnzqznxz7xKhuXhLBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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