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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3705a27a5fb86628f889eb1425aad7f685a768db0d024a1eeee7e30d68ad0670' 
  AND token = '1Kos7pT4OXYsX+KCU5QMH4irZsUwjy7TBdPGgsH3bIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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