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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f341f06358c886dd135c2ae33461228bc2ba718f404df0ed85abdeddb03565e0' 
  AND token = 'a4RRUMDwSAgYKFYRcn/BB/oumh+9r+uSMr8Up1cF0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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