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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615db9efc86b2b94975416f0841d8a6ee53c20ffe77e975015204c6fd59a696c' 
  AND token = 'Xl7plFUz6F8IllIdmg5X+A0WabEm7DFUxK0cwKprT/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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